function getKey()
 {  
  var tagdiv = document.getElementById("bbstag");
   
   var ptitle ;
  if (tagdiv!=null)
   {  
   		ptitle = tagdiv.innerHTML;
   } 
  else
  {		var noCharArr = new Array("(",")", "（","）","[","]","，","》","《","！","？","：","请","想","与","一起","可以","怎样","图片","图","讨论","大家","关于","我们","你们","我","你","的","吗","  ");
  	ptitle = document.title;
  	ptitle =ptitle.replace(/<[^>].*?>/g,"");  //去除HTML
  
  var pos = ptitle.indexOf("_");
  if (pos>0)
     {
     		ptitle = ptitle.substring(0,pos);     		
    }
    pos = ptitle.indexOf("[");   //去除话题标签
     //alert(pos);
   if (pos==0)
     {
     		ptitle = ptitle.substring(4,ptitle.length);     		
     }
   
    var oldstr;
   for (i=0;i<noCharArr.length; i++)
   { oldstr= "\\" + noCharArr[i];
  
   	 ptitle = ptitle.replace(new RegExp(oldstr,"gm")," ");
  }
  }
  return ptitle; 
 }